Smallville - Season 2, Episode 19: Precipice

Trailer

After Lana is almost assaulted by a college student, Clark loses control and injures him. The Kents are then sued for punitive damages that could cost them the farm, and Clark questions his powers--while trying to find a way to forestall the lawsuit. Meanwhile, Helen's ex-boyfriend arrives in town intent on winning her back. When she rebuffs him, he stalks her, prompting Lex to take action.